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Dozer drops into feeder on product coal stockpile resulting in engulfment…

- - - - Why was the product coal stockpile so high in the first place?
      - What production issues related to the mine and process plant resulted in such a large product coal stockpile?
      - Other stockpiling alternatives existed, but these resulted in cost increases to production due to multiple handling
      - What historical context existed regarding high stockpile levels?
      - Was the risk assessment regarding the high operating stockpile level reviewed as part of the investigation?
      - What role did the stockpile level play in the accident?
  - - - Dozer operators fearful of self-rescuer equipment during times of emergency
      - Excavator of sufficient size not readily available in plant to assist with emergency recovery of dozer
      - Dozer in-cab radio damaged in event, making communication with operator during recovery activities difficult
  - - - Known to be a risk taker amongst crew members
      - Multiple disciplinary discussions and records already on file
      - Person not well liked by peers on crew
      - Known quick temper and 'know it all' attitude
      - Person not good at receiving feedback regarding safety or work in general
  - - - Potential for enhancements to control system interlocks to assist in preventing operation of feeders and conveyor systems without additional layers of control in place
      - Opportunity for further technical assessment to feed into operating rules regarding stockpile maximum size
  - - - Rectify technical issues with GPS system used to locate feeders such that operators receive an in-cab indication of their proximity to hazard of live feeder
      - Install visual identification of feeder location with reference to adjacent buildings and landmarks
      - Install overhead catenary system for visual identification of feeder location
    - - Seat belt worn by operator
      - Self-rescuer was fully functional
      - Impact proof glass was effective in ensuring inside of cab was not filled with coal